Here is the box art for Gears of War 2. I'd say from the looks of it. There will NOT be 4 player co-op. Most likely the 2-4 co-op players in orange is Horde. Though I may be wrong. I Hope everyone enjoys this. You can download it below!
I take that to mean co-op is 4 player over xbox live/system link as horde is just an online game mode like annex. Well i can hope anyway I was under the impression you could now have 10 people in an online game as there is now 5 people on each team... yet it only says online multiplayer 2-8 in the box art above.